TM-9-2350-275-BD
M113 FAMILY CARRIER, PERSONNEL SELF-PROPELLED FULL-TRACKED
TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; BATTLEFIELD DAMAGE ASSESSMENT AND REPAIR
TM-9-2350-275-BD - Page 56 of 223
TM 9-2350-275-BD
SECTION VII. Engine Structure/Internal Components
3-15. PISTON, ENGINE, PERFORATED HEAD
General Information
Loss of engine power because of hole in piston head. For brief periods of operation it is
unnecessary to take any corrective action. For extended operation it is necessary only
to disable the fuel injector of the cylinder with the bad piston. the problem arises in
identifying the cylinder. The value of compression is not important, only enough to
ensure that there is no hole in the piston. While engine is still in the vehicle, check
each cylinder using the following procedure:
Limitations:
●
Degraded mobility
Personnel/Time Required:
●
2 soldiers
●
2 hours
Other Options:
●
Defer repairs
Procedural Steps:
1.
2.
3.
4.
Remove one rocker arm cover.
Start engine.
Press firmly on injector guide follower of each injector.
Listen for a change in engine operation. If a change is noticed, the cylinder is
functional.
5. If a change is not noticed, the cylinder is not functioning.
6. Verify the injector is functioning by swapping with another injector.
7. If injector is functional, readjust fuel rack to a “no-fuel” position at the defective
cylinder.
8. Record the BDAR action taken. When the mission is complete, as soon as
practicable, repair the vehicle using standard maintenance procedures.
3-14
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